Patients

This retrospective cohort study included 48 patients diagnosed with renal vasculitis at Seoul National University Bundang Hospital, a tertiary care hospital, between April 2003 and December 2013. The requirement for informed consent was waived because the study did not infringe the patients' privacy or health status. Demographic, physiologic, therapeutic and laboratory data were gathered from the electronic medical records database. Manual data verification was performed after patient datasets were merged. The long-term outcomes included end stage renal disease (ESRD) and all-cause mortality. ESRD development and all-cause mortality were determined from the ESRD registry database of the Korean Society of Nephrology and the Korea Statistics Service database, respectively.